22331231 has 4 divisors (see below), whose sum is σ = 24049032. Its totient is φ = 20613432.

The previous prime is 22331203. The next prime is 22331249. The reversal of 22331231 is 13213322.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22331231 is a prime.

It is a super-2 number, since 2×22331231² = 997367755950722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22331291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858881 + ... + 858906.

It is an arithmetic number, because the mean of its divisors is an integer number (6012258).

Almost surely, 2^22331231 is an apocalyptic number.

22331231 is a deficient number, since it is larger than the sum of its proper divisors (1717801).

22331231 is a wasteful number, since it uses less digits than its factorization.

22331231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1717800.

The product of its digits is 216, while the sum is 17.

The square root of 22331231 is about 4725.5931902778. The cubic root of 22331231 is about 281.6031799462.

Adding to 22331231 its reverse (13213322), we get a palindrome (35544553).

The spelling of 22331231 in words is "twenty-two million, three hundred thirty-one thousand, two hundred thirty-one".